Gforce is fast earning a reputation as an international hacker and is said to have defaced over 200 sites over the past year.

We're proud Pakistani hackers, we stand for a cause, for a reason

Gforce statement

A counter hacking group, Yihat, has forwarded contacts for Gforce - said to operate out of Karachi - to the US Federal Bureau of Investigation.

"All over the world hackers find new ways of getting in," says Mr Chakravarti.

"It's an ongoing battle."

Gforce's signature is to leave a message stating: "We're proud Pakistani hackers, we stand for a cause, for a reason."

Two years ago, when President Musharraf ousted Prime Minister Nawaz Sharif in a bloodless coup, Pakistani hackers broke into the official Pakistani Government website to leave a message congratulating the general.

And during the Kargil conflict in 1999, Pakistani hackers defaced an Indian Army site and left messages in support of Kashmiri separatists.